[M4F] I don't have anything *that* specific in mind, but I'd

[m4f] you invite your best friend to surprise me on my birthday

[M4F] you invite your best friend to the bedroom, on my birthday

[M4F] You invite your best friend to the bedroom

[M4F] you invite your best friend to the bedroom

[M4F] you invite your best friend to the bedroom

[M4F] you invite your best friend to the bedroom

[M4F] you invite your best friend to bedroom.

[M4F] My wife/GF brings a friend into the bedroom (MpMF4F)

[M4F] you invite your best friend to the bedroom

[M4F] you invite your best friend to the bedroom

[M4F] You invite your ex over on a lonely night